Implement -fno-validate-pch at the -cc1 level, which suppresses most

of the usual consistency checks used to determine when a precompiled
header is incompatible with the translation unit it's being loaded
into.

Enable this option when loading a precompiled preamble, because the
preamble loader will be performing all of this checking itself. Enable
the preamble-based test now that it's working.

This option is also useful for debugging Clang's PCH
(<rdar://problem/7532213>).

llvm-svn: 109475

1 files changed, 2 insertions, 1 deletions

diff --git a/clang/lib/Frontend/FrontendAction.cpp b/clang/lib/Frontend/FrontendAction.cpp
index dbbf69c8b12..9efa8c61db8 100644
--- a/clang/lib/Frontend/FrontendAction.cpp
+++ b/clang/lib/Frontend/FrontendAction.cpp
@@ -118,7 +118,8 @@ bool FrontendAction::BeginSourceFile(CompilerInstance &CI,
     if (!CI.getPreprocessorOpts().ImplicitPCHInclude.empty()) {
       assert(hasPCHSupport() && "This action does not have PCH support!");
       CI.createPCHExternalASTSource(
-        CI.getPreprocessorOpts().ImplicitPCHInclude);
+                                CI.getPreprocessorOpts().ImplicitPCHInclude,
+                                CI.getPreprocessorOpts().DisablePCHValidation);
       if (!CI.getASTContext().getExternalSource())
         goto failure;
     }